225494 2021-05-06 16:32:23 -0700 [macOS] Initialize HIToolbox library before entering sandbox 2022-02-10 16:28:18 -0800 1 1 1 Unclassified WebKit WebKit Misc. WebKit Nightly Build Unspecified Unspecified RESOLVED WONTFIX InRadar P2 Normal --- 1 bfulgham bfulgham bfulgham darin pvollan webkit-bug-importer oldest_to_newest 1757706 0 bfulgham 2021-05-06 16:32:23 -0700 AppKit calls into an older library (HLToolkit) to handle some menu operations. This library wants to know if its in a background application, and does so by communicating with LaunchServices. However, we close our connection to LaunchServices during WebContent process launch, which prevents these calls from working. Although this failure is harmless on production systems (it fails as 'background process', which is what we want) it triggers assertions and logging on internal systems that masks useful logs and wastes power and cycles. If we invoke HLTBIsCurrentProcessBackgroundOnly() at launch, we can complete our LaunchServices communications prior to cutting them off as we enter the sandbox. HLToolbox caches the result, so will perform properly for the rest of the WebContent process runtime. <rdar://problem/77171527> 1757713 1 427956 bfulgham 2021-05-06 16:39:00 -0700 Created attachment 427956 Patch 1757740 2 427956 ap 2021-05-06 17:30:38 -0700 Comment on attachment 427956 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=427956&action=review > Source/WebKit/ChangeLog:3 > + [macOS] Initialize HLToolbox library before entering sandbox Do we know if this will open any persistent XPC connections that we don't allow while sandboxed? 1757752 3 427967 bfulgham 2021-05-06 17:48:49 -0700 Created attachment 427967 Patch 1757802 4 427956 bfulgham 2021-05-07 00:20:53 -0700 Comment on attachment 427956 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=427956&action=review >> Source/WebKit/ChangeLog:3 >> + [macOS] Initialize HLToolbox library before entering sandbox > > Do we know if this will open any persistent XPC connections that we don't allow while sandboxed? The implementation of HLTBIsCurrentProcessBackgroundOnly is very simple. It calls a single LaunchServices command to read some process state and caches the result before returning the value. Subsequent calls do not call LaunchServices again. I’m confirming we already hit this call before entering the sandbox before landing, but I don’t see a way to open further connections from this one call. 1758070 5 428054 bfulgham 2021-05-07 16:10:24 -0700 Created attachment 428054 Patch 1758222 6 428054 darin 2021-05-08 16:43:34 -0700 Comment on attachment 428054 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=428054&action=review > Source/WebKit/ChangeLog:18 > + If we invoke HLTBIsCurrentProcessBackgroundOnly() at launch, we can complete our LaunchServices communications prior > + to cutting them off as we enter the sandbox. HLToolbox caches the result, so will perform properly for the rest of > + the WebContent process runtime. This comment does not clarify that calling GetGrayRgn does this. > Source/WebKit/WebProcess/cocoa/WebProcessCocoa.mm:689 > + // Cache background state for HLToolBox so AppKit doesn't try to talk to LaunchServices after we enter the sandbox WebKit style caller for a period at the end of the sentence. Change log comment calls this HLToolbox but this comment calls it HLToolBox. Comment does not make it clear why calling GetGrayRgn accomplishes what the comment says is needed. 1758223 7 428054 darin 2021-05-08 16:44:50 -0700 Comment on attachment 428054 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=428054&action=review > Source/WebKit/ChangeLog:17 > + If we invoke HLTBIsCurrentProcessBackgroundOnly() at launch, we can complete our LaunchServices communications prior > + to cutting them off as we enter the sandbox. HLToolbox caches the result, so will perform properly for the rest of This makes it sound like this will slow down web process creation. What we’re describing here sounds like synchronous IPC. 1759422 8 bfulgham 2021-05-12 15:43:20 -0700 The HIToolbox team suggested we use 'HiliteMenu(0)' instead, so I'll propose a patch for that. 1759424 9 428054 bfulgham 2021-05-12 15:50:27 -0700 Comment on attachment 428054 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=428054&action=review >> Source/WebKit/WebProcess/cocoa/WebProcessCocoa.mm:689 >> + // Cache background state for HLToolBox so AppKit doesn't try to talk to LaunchServices after we enter the sandbox > > WebKit style caller for a period at the end of the sentence. > > Change log comment calls this HLToolbox but this comment calls it HLToolBox. > > Comment does not make it clear why calling GetGrayRgn accomplishes what the comment says is needed. Will fix. 1759425 10 428422 bfulgham 2021-05-12 15:51:04 -0700 Created attachment 428422 Patch 1759431 11 428425 bfulgham 2021-05-12 16:02:11 -0700 Created attachment 428425 Patch 1759433 12 bfulgham 2021-05-12 16:06:02 -0700 I'm also running an A/B test to see if this triggers any PLT regression. 1759469 13 428425 darin 2021-05-12 17:13:36 -0700 Comment on attachment 428425 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=428425&action=review > Source/WebKit/ChangeLog:18 > + If we invoke HiliteMenu(0) at launch, we can complete our LaunchServices communications prior > + to cutting them off as we enter the sandbox. HLToolbox caches the result, so will perform properly for the rest of > + the WebContent process runtime. I never did see your take on whether doing this additional work at this point is OK from a performance point of view. 1762472 14 bfulgham 2021-05-21 10:23:10 -0700 (In reply to Darin Adler from comment #13) > Comment on attachment 428425 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=428425&action=review > > > Source/WebKit/ChangeLog:18 > > + If we invoke HiliteMenu(0) at launch, we can complete our LaunchServices communications prior > > + to cutting them off as we enter the sandbox. HLToolbox caches the result, so will perform properly for the rest of > > + the WebContent process runtime. > > I never did see your take on whether doing this additional work at this > point is OK from a performance point of view. I've got some A/B tests running in the Perf bots to see if we catch any regression. I'll discuss with Per Arne before we land. 1765798 15 bfulgham 2021-06-01 15:30:37 -0700 A/B tests completed on low-end and high-end hardware, and confirmed there was no regression. Next I'll confirm this change doesn't introduce any new connections we didn't have prior to making this call. 1765820 16 bfulgham 2021-06-01 17:00:57 -0700 It looks like this change causes new connections to be opened to distnoted, logs, and diagnosticd, which we don't need for other reasons and would not be closed before entering the sandbox without modifying other frameworks. Since this change was being done to avoid the equivalent of a debug assertion in internal systems, it's not worth making the change. Eventually, we will remove these frameworks from the WebContent process entirely, resolving the problem permanently. 427956 2021-05-06 16:39:00 -0700 2021-05-06 17:49:22 -0700 Patch bug-225494-20210506163859.patch text/plain 2856 bfulgham U3VidmVyc2lvbiBSZXZpc2lvbjogMjc3MTA0CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViS2l0L0No YW5nZUxvZyBiL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCmluZGV4IDdlNzkzOTc5OWY1ZDg2MDY4 Mjg4ZDYyYjI2NGJhZTM1NjE2MDNlNjAuLjc3MzMzMTgzNTMwMTNjNGU3NTFjZjU5MDBhOGY3Y2M1 ZDc3YTRkYmUgMTAwNjQ0Ci0tLSBhL1NvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCisrKyBiL1NvdXJj ZS9XZWJLaXQvQ2hhbmdlTG9nCkBAIC0xLDMgKzEsMjUgQEAKKzIwMjEtMDUtMDYgIEJyZW50IEZ1 bGdoYW0gIDxiZnVsZ2hhbUBhcHBsZS5jb20+CisKKyAgICAgICAgW21hY09TXSBJbml0aWFsaXpl IEhMVG9vbGJveCBsaWJyYXJ5IGJlZm9yZSBlbnRlcmluZyBzYW5kYm94CisgICAgICAgIGh0dHBz Oi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD0yMjU0OTQKKyAgICAgICAgPHJkYXI6 Ly9wcm9ibGVtLzc3MTcxNTI3PgorCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEp 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